(trunk) PXB-3427 : Parallelize incremental delta apply in incremental backup #1644
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…prepare Problem: -------- xtrabackup on incremental backups, create .delta file for every IBD file found. On incremental prepare phase, the pages from .delta are applied to the actual tablespace. The .delta files are processed serially Fix: ---- 1. Apply .delta files paralelly with the number of threads from --parallel option 2. At the end of apply, there is space extension (increasing the ibd size according the size recorded in header), this is also executed parallely now with the --parallel number of threads.
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